[thorng]

I have setup multiple 3.0 iPhones with our Zimbra Setup and just want to share my setup instructions. I am sure there will be some incompatible calendar items but I have not seem any major issues. This is the best (and working) Calendar Sync I had tried so far.

Here is how I add CalDav on iPhone

1. Go to Settings, for "Email, Contact and Calendar" add new account
2. Choose Other
3. Chooss Caldav
4. enter your zimbra hostname, username, password
*IMPORTANT* not an URL here
5. Click Next
6. The Verification will fail on SSH choose cancel
7. go in to the advanced settings now appear and change the port is changed to 433 instead of 8443 (or 80 if not using https)
8. My URL looks like https://mail.mydomain.com:443/principals/users/<username>
9. Click Save
10. Click Next again on the previous menu and this time the verification should pass.
11. You are done. Goto the iPhone Calendar and check it out.

I am seeing all my selected calendars on iPhone including shared calenders, even the color scheme match the color on zimbra. I can add and delete events in the CalDAV calendars. There is even a tasks event calendar but always empty and does not sync the items back to zimbra if you add items. We set the fetch frequency to Manual, It seem to drain the battery fairly quickly if the fetch frequency is anything but manuel. Also, we use a commercial certificate so there is no self-signed certificate issue with HTTPS